#include<stdio.h>
int main()
{
	size_t my_strlen(char*);
	char arr[] = "i want to eat an apple!";
	printf("%zd\n", my_strlen(arr));
	return 0;
}
size_t my_strlen(char* arr)
{
	size_t count = 0;
	while (*arr)
	{
		count++;
		arr++;
	}
	return count;
}